Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 145 for “"measurement errors"”.
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Resolving Measurement Errors Inherent with Time-of-Flight Range Imaging Cameras
… Currently ToF range cameras suffer from measurement errors that are highly scene dependent, and these errors limit the accuracy of the depth measurement. The major cause of measurement errors is multiple propagation paths from the light source to pixel, known as multi path interference. …
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Causal Inference with Measurement Errors: with Applications to Experimental and Observational Studies
Measurement errors cause problems in causal inference. However, except for canonical cases, researchers rarely realize the existence of measurement errors in their studies. As a result, they sometimes fail to adjust for them. By combining tools drawn from the literature on machine learning, causal …
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The effect of wind measurement errors on linear simulations of equatorial circulations
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1984.
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Bayesian Measurement Error Modeling
<p>A mixture measurement error model built upon skew normal distributions and normal distributions is developed to evaluate various impacts of measurement errors to parameter inferences in logistic regressions. Data generated from survey questionnaires are usually error contaminated. We consider …
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Some New Estimator in Linear Mixed Models with Measurement error
… the observation of variables is subject to measurement errors, and ignoring these in data analysis can lead to inconsistent parameter estimation and invalid statistical inference. Therefore, it is necessary to extend LMMs by taking the effect of measurement errors into account. …
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Topics in functional data analysis and machine learning predictive inference
… contaminated with a functional nugget effect and measurement errors. Unified asymptotic convergence rates are developed for the proposed estimators that are applicable to both sparse and dense functional data. Simulation studies and analyses of two real-estate datasets show that our proposed …
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Essays on Cross-Sectional and Network Dependence
… dependence structures, whilst allowing for measurement errors in the observations of the structure. We establish the convergence rate of such estimators under weak conditions on the measurement errors and we argue that it is often beneficial to include auxiliary structural information even …
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Application of process data reconciliation in power plants
… plants and chemical processes requires process measurements for optimal operations. Process measurements are essential for plant performance optimization, process monitoring and process control. It is vital to have reliable and accurate process data to achieve process optimization. However, …
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Locating Structural Damage in Real Time Using Contrast Maximization
… reliability of the approach when modeling and measurement errors are present, the contrast maximization approach is then combined with an approach based on changes in frequency signature to develop the average angle technique. A damage detectability measure is defined which, for a given level …
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Recurrent Event Data Analysis with Mismeasured Covariates
… are recorded with q (q ≤ p) collected with errors. Of interest in this dissertation is the estimation of the regression parameters of event time regression models accounting for the covariates. To circumvent the problem of bias and consistency associated with model's parameter estimation in …
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Effect of upper stem diameter and errors of measurement on the accuracy of volume equations
Measurements of DBH, upper diameters, merchantable height and total heights were made on 80 standing white oaks (<i>Quercus alba</i>) which were then felled for detailed measurements of the same parameters. The data obtained were used to evaluate the accuracy of standing tree measurements, to …
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Impact evaluation of cyber-physical uncertainty on power systems
… impact in two applica- tions: (i) the impact of measurement uncertainty on power system dynamic performance (at the transmission level), and (ii) the impact of uncertain phenomena on power systems coordinating demand response resources (at distribution level). With respect to the first …
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Implementation of a High-speed Sinusoidal Encoder Interpolation System
… is presented for correcting gain and offset measurement errors based on ellipse-fitting techniques.
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Equatorial F -Region Plasma Density Estimation With Incoherent Scatter Radar Using a Transverse -Mode Differential -Phase Method
… elements of the covariance matrix of measurement errors can be ignored. An advantage of this is that the cross-correlation data have Gaussian distributed errors even when the SNR is weak, whereas under the same conditions the phase errors are no longer Gaussian. The determination of …
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Extensions to the data reconciliation procedure
… the quality of data obtained from automated measurements in chemical plants. All measuring instruments are subject to error. These measurement errors degrade the quality of the data, resulting in inconsistencies in the material and energy balance calculations. Since important decisions are …
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Essays on Government Transfers and Labor Markets
… problems due to nonrepresentative samples and measurement errors. Nonrepresentativeness is refected in undersampling of owners with low incomes. Measurement errors arise because respondents do not refer to relevant documents and possibly because of framing issues. We conclude that predictions …
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Vision-based trailer pose estimation for articulated vehicles
… sensors for articulation angle and off-tracking measurement, and relevant vision-based technologies. This is followed by an introduction to pertinent computer vision theory and terminology in Chapter 2. Chapter 3 describes the development and simulation-based assessment of an articulation angle …
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Worker flows in South Africa from 2008 to 2019: Evidence from matched quarterly labour force survey
… and pattern of worker flows in South Africa. Measurement errors may exist in our estimates, but a robustness check shows a high degree of consistency between our worker flow estimates and those in the past literature, implying that measurement errors are moderate.
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Two Essays on Asset Pricing
… two chapters. The first chapter shows that the measurement errors in betas for stocks induce corresponding measurement errors in alphas and a spurious negative covariance between the estimated betas and alphas across stocks. This negative covariance between the estimated betas and alphas results …
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Statistical Methods for Large Complex Datasets
… p small n' setting for datasets that contain measurement errors or change points.
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